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As I'm new to this forum, I'm not allowed to post any screenshots or URLs. But if you like, you can find the tool at SourceForge.net. Just search for "AMDOverdriveCtrl". There I have posted the source code and a 64bit deb package.

Any feedback would be appreciated. Right now I don't have any documentation, but most things should be more or less obvious.

Dependencies:
- wxWidgets 2.8.x
- libdl
- libpthread

Tested with a Radeon 4870 and Catalyst 10.11, 10.12 with Ubuntu 10.10.

As every overclocking utility - use it wisely. Don't fix the fan speed at a low level and turn up the frequencies!

some more info about the tool

I think I should add some more info on how the tool works.

The Catalyst driver chooses a performance level according to the GPU load. For example most of the time for normal desktop use the low level is active and only sometimes the level is raised for a second. I have compiz enabled and for me this happens now and then if I move the mouse over my AWN dock.

With my tool you can change the frequencies and voltages for each level (low, mid, high). But there is one thing you should obey:

Keep the memory frequency constant in all three levels. Otherwise you will see some flickering when levels are changed. I guess this is a problem of the video HW (at least with the 48xx series). My suggestion to solve this problem are application profiles.

Create a default profile for desktop usage with low frequencies and low voltages to save some energy and to keep the video card cool and the fan quiet. Then create a high performance profile for games and other demanding applications. Go to the AppProfile tab and add the combination of your game and profile to the list. Don't forget to tick "enable". Now, whenever your game starts, the high performance profile will be activated and the screen only flickers once. When you quit the game, your default profile will be activated again.

To create an app profile, just set all the frequencies, voltages and fan profiles you want and save it as a *.ovdr file.

@energyman:
Sorry for the tar problem (I will correct that). Meanwhile I suggest to use the git repository also found on SourceForge. If you want to compile the sources you also have to get the ADL SDK from AMD. It is not included in the tar ball or the git repository because I don't know if I'm allowed to put it in or if AMD restricts the distribution of the SDK to their download site.